Split-foot knitting machine



Nov. 7,' 1939. R. H. LAWSON 2.178.911

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SPLI'l' -FOOT KNITTING IACHHIE Original Filed Aug. 16, 1935 15ShOOtB-ShaSt 14 [AG/52177019: IaBEkTHZAWJMg Nov. 7, 1939. R. H. LAwscsN2,178.911

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fjvvszvroz: 112035277? MWS'M' Patented Nov. 7, 1939 UNITED STATES PATENTI OFFlCE 2,178,911 SPLIT-FOOT KNITTING MACHINE Robert H. Lawson,Pawtucket, R. I., assignor to Hemphill Company, Central Falls, It. I., acorporation of Massachusetts Application August 16, 1935, Serial No.36,563 Renewed April 28, 1939 be knit in a reciprocatory manner toproduce the well-known split-foot stocking.

This case is a continuation as to-all common subject matter of theapplicants co-pending case, United States Serial Number 439,976, filed-March 29, 1930, now Patent No. 2,083,027.

In the drawings: 7

Fig. 1 shows in elevation afu1l length, fashioned stocking produced uponthe machine herein described;

. Figs. 2 through 5 show modifications of the foot structure of astocking similar to that shown in Fig. 1, which are capable of beingproduced on the same machine herein described; Fig. 6 is a frontelevation of the split-foot knitting machine embodying my invention;

Fig. 7 is an elevation showing in general the mechanism as viewed fromthe right side of Fig; 6. Fig. 8 is an elevation taken from the.opposite 25 side of Fig. 6;

Fig. 9 is a plan view, partly in section, showing the jack cams andtheir operating mechanism;

Fig. 10 is a plan view, partlyin section, showing the main cam block,narrowing picks and instepcams;

Fig. 11 shows in elevation the mechanism of- Fig. 10; g

Fig. 12 is a plan view showing in detail one of the high-splice andnarrow sole cams and part of its operating mechanism; a

Fig. 13 is an elevation of the mechanism shown in Fig. 12;

Fig. 14 is a plan view similar to Fig. 12, but showing the otherhigh-splice and double sole cam;

Fig. 15 is an elevation of the mechanism shown in Fig. 14;

Fig. 16 is an elevation showing the instep cams 45 and some of theiroperating mechanism;

Fig. 17 corresponds to Fig. 16 but shows the cams in reverse position; 1

Fig. 18 is a. view of the instep-cams as seen from the center of theneedle cylinder; 50 Fig. 19 is adetail view showing operating mech anismfor the eyelet closing cam, auxiliary cam block and auxiliary centercam;

Fig. 20 is a. view showing in detail some of the i mechanism foroperating the high-splice and 55 narrow sole cams;

Fig. 21 is a detail view of part of the mechanism showing in Fig. 20,the cam operated lever shown in opposite position; v

Fig. 22 is a development showing a portion of the needle cylinder, longbutt needles and short butt needles in section;

Fig. 23 is a development showing in section the corresponding portionsof the needle cylinder and jacks therein;

Fig. 24 is a sectional view of the needle cylinder 10 showing the lowerpart of a needle and its jack in operating position;

Fig. 25 is an elevational view showing the oper-, ating mechanism forthe widening picks;

Fig. 26 is a diagrammatic view showing the auxiliary knitting cams,parts of the needle raise cams and an auxiliary needle raise cam;

Fig. 27 is a sectional view showing the needle about to draw a stitchover the novel sinker;

Fig. 28 is a sectional view corresponding to Fig. 20 27 and showing thestitch completely measured;

Fig. 29 is a sectional View similar to Figs. 27 and 28, and showing thenovel sinker acting to relieve the fabric of strain;

Fig. 30 is a sectional view showing a needle in 25 raised position; i

Fig. 31 is a plan view showing the sinker cap and certain of the sinkercams;

Fig. 32 is similar to 26 but shows a modification of the mechanismtherein shown;

Fig. 33 is a detail of one type of sinker cam;

Fig. 34 shows in detail another type of sinker cam;

Fig. 35 is a sectional view showing the sinker 35 head and mechanism foroperating the sinkers in the auxiliary side during heel and toeknitting;

Fig. 36 is a diagrammatic view showing the path of needles and jackbutts through the cams during knitting of the leg,

Fig. 37 is a diagrammatic view showing the knitting of the high-splice,the needles moving in a clockwise direction;

Fig. 38 is similar to Fig. 37 but shows the operation in ananti-clockwise direction;

Figs. 39 and 40 are diagrammatic views showing reciprocations in bothdirections during heel and toe knitting;

Fig. 41 isa diagra matic view showing knitting during the instep andsole of the stocking;

Fig. 42 is a diagrammatic view showing knitting of the instep and soleadjacent the ring toe at the so-called bunion patch;

Fig. 43 is a diagrammatic view showing knitting of the ring toe; and

Fig. 44 is a diagrammatic view showing operation of needles and jacksprior to formation of a small heel.

As in the co-pending case Ser. No. 439,976, above mentioned, the machineherein'disclosed is preferably, although not necessarily, of the rotaryneedle cylinder, latch needle type. The machine is capable of knitting asplit-foot stocking of exceptional quality since the leg and instep areboth knitted at the auxiliary feed and the welt, high-splice, sole, ringtoe, and the heel and toe are knitted at the main feed or side of themachine. While the idea of knitting the leg and instep at the same feed(auxiliary-feed) is not in itself new, machines constructed for knittingsuch a split-foot stocking have not been particularly satisfactoryespecially in regard to simplicity and automatic control of the variousknitting cams during knitting of the several parts of the stocking.

The machine herein disclosed is adapted to produce a suture of the typeshown in the patent to Augustin Gagne No. 1,673,76 although anyconventional suture may be employed without departing from the spirit ofthe invention.

It is general practice when knitting split-foot hosiery to knit thehigh-splice and/or sole upon approximately one-half the series ofneedles, generally short butt needles, and the instep on the remainingportion of the needles, generally long butt needles. The series ofneedles which I employ is preferably divided into an equal number oflong and short butt needles as above mentioned, but in addition I employa number of jacks at either side of the needle cylinder, said jacksbeing placed directly beneath the short butt needles which adjoin thelong butt needles, and further, these jacks may be divided into anyconvenient number of long and short butts. By automatic and selectiveoperation of these long and short butt jacks I am able to so control anydesired number of short butt needles which are adjacent the long buttneedles that the instep may be produced on more than one-half the seriesof needles and at the same time, the highsplice and/ or sole will beproduced upon less than one-half the complement of needles, suchpractice being desirable when knitting ladieshosiery for wear withslippers or sandals. By properly dividing the' said jacks into long andshort butts, I am able to produce the heel upon a relatively smallnumber of needles so that the point of intersection of the narrowed andwidened portions of the same will be separated a few wales from thesuture seam itself, this small heel bein P ssible of manufacture incombination with the narrow high-splice and sole or in combination witheither one as desired.

During knitting some of the needles draw stitches at one set of cams andas the rotation or'oscillation of the needle cylinder continues,

thesesame needles will again pass under the opposite set of lmittingcams and again tend to draw or stretch the loops which are held in thethroats of sinkers, said sinkers being pushed inwardly to their fullextent. The' mechanism herein shown very efiectively prevents theproduction of defective fabric from the above mentioned causes and Ihave disclosed a new type of sinker and a modified form of needle raisecam which is adapted to actuate the needles to relieve the strain on theloops when the needles pass through the auxiliary knitting cams.

Referring to Figs. 1 through 5 which show various modifications ofsplit-foot stockin s which I may produce, these stockings preferably a1-though not necessarily, are made by knitting from top to toe and a weltmay be knitted upon the machine prior to knitting the remainder of thestocking or, if desired, a welt may be knitted in another machine andtransferred to the splitfoot machine prior to knitting the stockingitself.

In Fig. 1 is shown a stocking comprising the welt I and'a fashioned legportion 2 which extends down to the top of the high-splice 3. The

welt is preferably knitted at the main feed and a leg portion is knittedat an auxiliary feed, both being produced by round and round knitting.When the beginning of the high-splice portion is reached reciprocatoryor split-foot knitting is commenced, the high-splice 3 being knitted atthe main feed and the instep portion 4 being knitted at the so-calledauxiliary feed. Following this practice the leg and the instep will beknitted from the same yarn and by the same set of cams ,so that nocontrast will appear at the dividing line between the leg and instep. Anextra reinforcing yarn may be knitted into the high-splice for anydesired width as shown at 5. The highsplice may be made on one-half theneedles or may be knitted. on less than that number of needles dependingupon the set-up of jacks used under the short butt needles. In thestocking shown, the high-splice is knitted on a few less than one-halfthe complement of needles and the sole 6 is also produced by knittingupon a few less than one-half the short butt needles. The heel I,narrowed and widened in the usual manner, is knitted upon a few needlesless than the high-splice and sole were produced upon so. that thecorner or intersection of the narrowing and widening segments thereofwill be spaced a few wales from the suture. Such a construction resultsin an exceptionally strong and wear resistant foot. Several coursesbefore the ring toe 8 is reached, the jacks are taken out of action andboth instep and sole are lmitted upon an equal number of needles toproduce the so-called bunion patch 9. After the ring toe 8 has beenknitted in a conventional fashion, a narrowed and widened toe l0 may beknitted in any desired way. The modification at Fig. 2 is produced in amanner similar to that previously disclosed relative to Fig. 1, however,the high-splice II is knitted upon fewer needles while the heel l2 andsole l3 are knitted upon one-half the full complement of needles.

In Fig. 3 I have shown a modified form of foot in which the high-splicel4 and sole I! are knitted upon one-half the needles and the heel I6 isknitted upon a few less than one half the needles.

In the modification shown in Fig. 4 the highsplice l1 and heel [8 areknitted as in Fig. 3, the sole 1! being dropped down several wales andknitted upon comparatively few of the short butt needles. Such a.construction results in a strong, wear resistant heel in combinationwith a cradle foot, such stocking being popular for wear with sandals.

In Fig. 5 the high-splice and sole have been knitted on less than halfthe needles while the heel 2| has been knitted upon fewer needles thansole 22 has. No reinforcing has been done in the high-splice. Thesemodifications are merely given as examples of the many combinations offoot structure which I may automatically knit .upon the machine hereindisclosed, the only Referring to Figs. 6, '7 and 8 which show the cam 48meral 45.

justable by means general construction of a frame 23 has mounted thereonthe so-called circular base 24, main drive shaft 25 and pulleys 25, 21and 28 employed as high speed, slow speed and idling pulleysrespectively. A needle cylinder 29, herein shown as of the rotary type,carries in the usual slots or tricks, latch needles which are adapted todraw stitches over sinkers mounted in a sinker head 38. A latch ring 3|of more or less conventional construction has pivoted at 32 yarn guides33 which are controlled in the manner usually employed in the Bannertype machine, by levers 34 pivoted in an enclosure 35 and which are inturn actuated through the connection of wires (not shown) which extenddown to a corresponding series of levers 36 one end of which bears uponsuitable cams generally designated at 31 upon cam drum 38 rotating withthe usual cam shaft 39. Another shown at the right of drum 38 iseffective through a lever 4| to shift a clutch at properly timedintervals for changing from rotary to reciprocatory knitting and viceversa. Such mechanism is well known in Banner machines and isillustrated sufiiciently in the Gagne patent herein mentioned, so thatno further disclosure of the same need be given at this time.

A main cam block is generally designated at .42 and is mounted upon camplate 43 which is in turn capable of being raised and lowered for aslight extent by the usual fashioning cams (not shown) on a drum hereingenerally indicated at 44 and mounted upon main cam shaft 39.

A second cam block, herein termed the auxiliary cam block, is generallydesignated by nu- This auxiliary cam block is mounted upon the otherhalf 48 of cam plate 43 and this camplate is also adjustable forpurposes of fashioning or changing stitch length by means of a barsliding in bracket 41, said bar carrying a stud 48 at its lower endwhich stud is in contact with one arm 49 of a bell crank lever 58. Theother arm 5| of bell crank lever 50 extends downwardly and carries atits lower end a series of contact elements 52 which are separately adofscrews 53. These contact members 52 bear against certain cams, one ofwhich is designated by numeral 54 upon a drum 55 rotating on shaft 58.These cams are adapted to control the stitch length at the auxiliaryfeed by raising or lowering cam block 45 at the proper time.

Bracket 47 extends to the left as is shown in Fig. 8, forming an arm 51which serves to hold a pin 58 about which lever 50 swings. At anintermediate portion of bracket 41 is bolted or otherwise secured anextension 59 which in turn is secured to the upper end of an A-bracket60. This bracket 68 is firmly secured to the base of the'machine bybolts 5| passing through the feet 62. This bracket serves very rigidlyto hold bracket 41 and its attached mechanism in fixed position andfurther, serves to guide the lower end of lever arm 5|. As seen in Figs.6 and 8, bracket 68 has an extension 63 which terminates in an angularportion 64 in alignment with another projection shown at 65. Screws and61 are adjustably threaded into these extended portions of bracket 68lower end of 5| so that it will swing in a predetermined plane, thusavoiding vibration and assuring that contact members 32 will bearagainst their cams in a proper manner.

The shaft 56 carrying cam drum 55 is mounted for rotation with a bearing58 at the upper 2,173,911 this split-foot machine,

. which contact levers and serve toguide the finger will remain end of abracket 69 bolted to an angular brace 10 which is in turn rigidlyconnected to a frame of the machine. This shaft 58' extends across themachine at the rear side thereof and carries a sprocket wheel H at theopposite end as shown in Fig. 7. This sprocket wheel H is driven by asuitable chain I2 which similar sprocket wheel (not shown) fast to camshaft 39. A chain guard 13 is attached to the frame and serves toprotect the anism from dust and dirt and at the same time prevents theoperator from getting caught in the chain or in the sprocket. An arm 14pivoted at 15 carries at its opposite end a weighted tensioning sprocket16, thus maintaining the chain under suitable driving tension at alltimes.

In the sameFig. '1 are shown the belt shifter generally indicated at 11,the depending lug 18 case may be, such mechanism being the conventionalconstruction on Banner and like machines.. 'Ihe high-splice and toe ofthe stocking may be reinforced by an additional yarn inserted throughoutany desirable portion of the width of the same. Referring to Figs. 7 and9, there is described mechanism which is used for introducing thisreinforcing yarn which is knitted at the main yarn feed. As mentionedbefore, a series of yarn guides 33 are pivoted at 32 in the latch ringor carrier ring 3| and these yarn guides are normally controlled eitherto feed their yarns to the needles or to withdraw the yarns out offeeding relation to 'the needles inaccordance with certain cams 3T; 33connected through wires engages another (not shown) to other levers 34which engage the yarn guides and actuate them in a normal manner. To oneof these levers 34 which coacts with the particular yarn guide which isto feed the extra reinforcing yarn, vertically extending link BIL-Fig.9, to a lever 8| pivoted at 82 on a fixed bracket 83. The bracket 83extends in an angular fashion at either side to form a connecting base84 which attaches through suitable bolts to the circular base of themachine. At the opposite end lever 8| is slotted and engaged by a,laterally projecting pin 85, said pin being connected to the outer endof a lever 86 which is fast to shaft 81. Shaft 81 is capable of beingrocked through a small angle by mechanism presently to be described,that is, when the reinforcing finger is to be operated by it, but atother times the said shaft is shiftable along its axis to a positionwhich renders it inoperative. The shaft 81 is rotatable and also capableof being shifted axially in bearings 88, 88 which extend upwardly from abracket 90 carried by the circular base. At its outer end, shaft 81 hasfixed thereto a lever 9| which carries at its lower end a hardened camfollower 92, Fig. 7. A cam of 104 gear shaft 94 and carries thereon camsegments 95, 9B, 91 and 98 and these segments are adjustable about thecircumference of cam plate 93 and form certain spaces or depressions 99and Hill approximately 180 degrees apart. By

adjusting cam segments 98 it is possible to vary the angular extent ofthese depressions and thus, the time intervals the reinforcing yarn infeeding position, it being understood that when follower 92 rides uponthe concentric surface plate 93 is fixed to the end 7 of the camsegments the reinforcing yarn is out of feeding relation to the I jactuating follower 92, lever 9I and the attendant mechanism as thefollower drops within one of the depressions, I provide a suitabletension spring IN connected at one end to lever 9I and at the oppositeend ofa pin I02 projecting from a suitable part of the circular base.

At the end of shaft 81 opposite that to which lever 9I is connected, Imake fast a collar I03 which has a suitable groove I04 therein. On abracket I05 attached to some suitable part of the machine frame I pivotat I05 a bell crank lever having a horizontal arm I01 and a vertical armI00, said vertical arm carrying a projecting pin I09' for engagingwithin the slot I04. At the other end of horizontal arm I01 I pivot at II0, the

upper end of a depending link III which connects at its lower end to alever II2 which bears upon a cam (not shown) on the cam drum 2',

which is suitably proportioned to shift shaft 81 axially in its bearings88 and 09. In Fig. 9 shaft 81 is shown in its inoperative: position,said shaft being pushed to the right as seen in the figure untilfollower 92 is out of operating position relative to the cam segments95-98. .The shaft 81 is pushed to the right against the action of acompression spring I I3 hearing at one end against bearing lug 89 and atthe other against a collar II4 clamped to shaft,v 81. When lever arm II2falls ofi its supporting cam (not shown) spring I I3 will function toshift shaft 81 to the left until stopped by collar II5 striking bearinglug 89. In this position follower 92 will engage cam segments 95-98 inwhich case the reinforcing finger will be operated. Pin 85 has been madeof sufficient length to slide within the co-acting slot in lever 8| sothat it will always engage the same in either of its positions.

The mechanism just described controls the splicing or reinforcing yarnfinger only at such times as splicing is going on. That yarn finger isunder the usual control from the main pattern drum and will be allowedto move to operative position at the beginning of splicing and will bewithdrawn at the end of splicing in the usual way. That control from themain drum trated in this case since the same is well-known by thoseskilled in the art and is illustrated and described in Lawson Patent#2,083,027 at Figs. 19 and 20 and the description relative thereto.

The main cam block generally designated by numeral 42 is shown in Figs.6, 10, and 11; the cams being diagrammatically shown in Figs. 36 through44. This cam block is capable of being retracted when needles are to beleveled for purposes of transfer and at other desired times by means ofhell crank lever II6 connected to the block itself by a link II1, saidbell crank lever being actuated by a rod II8 which operates from a camdrum in a conventional manner. A spring I I9 and plunger I20 operate tohold the cam block inwardly against the cylinder to be retracted asabove mentioned.

This cam block carries knitting cams I2I, I22, upper center cam I23 andlower center cam I24. Knitting cam I2I is capable of beingretractedduring round and round knitting by means of a link I25 connected to astud I25 fast in the end of a sliding stem which forms an extension ofthe cam. I2I. Link I25 is connected to one arm of abell crank lever I21and the other end of that lever is connected to a depending link I28 isnot illusexcept when it is of the cam above mentioned. Narrowing picksI33 and I34 are also carried by this main cam block and narrowing pickI33 is automatically swung out of the way when knitting cam I2I iswithdrawn from action by means of a finger I35 which slides with the camand swings pick I33 by means of a pin I35 projecting therefrom.

A bracket I31, shown in detail in Figs. 10, ll, 16, 1'1 and 18,constitutes a suitable mounting for upper instep cam I38 and lowerinstep cam I39. This bracket I31 is securely bolted to cam plate 43 andhas two slots I40 and I in which stems I42 and I43 of the upper andlower instep cams slide. A plate I44 is secured to bracket I31 by screwsI45 and serves to hold cam stems I42, I 43 within their operating slots.It is a feature of these so-called instep cams and their operatingmechanism that either cam may be actuated independently of the other orthat both cams may be operated at the same time. Lower instep cam I39 isnormally held in position to engage long butt needles by means of aspring I46 which encircles a plunger I41 attached to said cam and alsobears within a drilled hole I48 within the bracket. The stem I43 has aslot shown at I49, said slot being beveled at its rear end as shown atI50. An operating rod I5I slides withinva vertical opening passingupwardly through bracket I31 at the left hand edge of slots I40, I, thisrod being cut away as shown at I52 to allow a limited movement of 'camI39 and its stem I43; and further, a beveledsurface I52 on the operatingrod acts to withdraw cam I39 from operative position as the said rod isdrawn downwardly whereby beveled edges I52 and I co-act to cam said stemI43 outwardly.

The upper instep cam I38 has a short stem I42 which slides within grooveI40. Operating rod I5I is cut away to leave only a narrow portion I53extending upwardly. Bracket I31 is slotted at I54 and a pin I55 fast tostem I42 projects upwardly through this slot. At I55 I have pivoted abell crank lever I51, one arm of which has a slot I58 engaging said pinand the other arm carrying, connected thereto at I59, a link I50 whichis actuated by suitable mechanism to rock bell crank lever I51 and movethe cam I30 into and out of position. The other end of link I60 hasadjustably attached thereto a connecting element I5I which is pivoted atI52 to one arm I53 of another hell crank lever. This bell crank lever ispivoted at I64 to a bracket I65 fast to the yarn lever bracket of themachine and the other arm I65 of said lever has a connection I51 througha hole in which rod I58 projects. This rod I58 is connected to one endof a lever the other end I69 of which contacts the pattern chain I58shown in Fig. 6. Two collars I10 and I10 are clamped to the rod I68 andmaintain springs HI and I12 under tension so that loose collars I13, I14will act upon lever arm I65 through connection I61 in a resilientmanner.

As before described, rod I5I operates to withdraw the lower cam I39 fromoperative position. For the purpose of actuating this rod I5I I havepivoted a bell crank lever having arms I15 and I16 about a pin- IT! in alug I18 extending downwardly from a plate 43. The arm "5 is slotted asshown at I19 and a pin I88 works in said slot and is attached bythreaded engagement, to the lower end of rod I5I. At the outer end ofarm I18 is connected a link I8I which swings about pivot point I82. LinkI8I extends over to the right, through the frame of the machine andconnects to the upper end of clutch shifter so that the lower instep camis actuated upon going into and out of reciprocatory knitting.

The auxiliary cam block has been generally designated by numeral 45 andcarries knitting cams I83 and I84, center cam I85, guard cam I86 andauxiliary raise cam I81, this latter cam being preferably formed in twoparts having an overlapping joint at the center, see Fig. 32. These camsfunction at the auxiliary side of the machine to knit the leg portionduring circular knitting and the instep portion of the stocking byreciprocatory or split-foot knitting. The mechanism for raising andlowering the block forjpurposes of fashioning or changing stitch lengththrough its connection to plate 46 has been previously described.

Widening picks are also carried on this auxiliary cam block and aredesignated in Figs. 6 and 25 by numerals I88 and I89. The mechanism foroperating these picks is of simplified and novel construction. On a yokeI98 attached to the auxiliary cam plate, pivoted at opposite points I9Iand I92 are arms I93 and I94 adapted to swing in opposite directionsunder the influence of a plunger I95 which extends downwardly through Isaid yoke and is operated in a known manner by a widening pick leverI96. Plunger I95 carries alaterally extending pin I91 which engagescorresponding slots I98 in the ends of levers I 93, I94. Widening picklever I 95 is actuated to push plunger I95 upwardly which swings thearms I93, I94 in one direction and a spring I99 attached at one end tothe yoke and at its other end to pin I9'I-'is under sufiicient tensionto draw plunger I95 in the downward direction. Widening picks I88, I89carry pins 288, 28I extending in a rearward'direction. These pins areengaged by hardened contact elements 282, 283 which are adjustably fixedat the outer ends of the oppositely swinging arms, said adjustment beingpossible by sliding screws 284 in slots 285 be ore tightening the sameto clamp the respectiv hardened elements 282, 283 to their arms.

r In Figs. 22, 23. and 24 I have shown the needles and jacks which it isnecessary-ate employ for making such a stocking as is illustrated inFig. 1,

for example. Certain sections of the needle cylinder 29 have beenrepresented as if developed into a plane in Fig. 22. Short butt needles286 and long butt needles 281 have been shown therein. it beingunderstood that the machine contains substantially an equal number ofeach type of needle, separately divided at the opposite halves of thecylinder.

In Fig. 23 I have shown the corresponding portions of the needlecylinder and certain long butt jacks 288 and short butt jacks 209disposedtherein. For making such a stocking as is shown in Fig. 1, Iplace at either side of the needle cylinder under the terminal shortbutt needles, nine long butt jacks and adjacent these long butt jacks,three short butt jacks; I have chosen this division of jack butts merelyfor purposes of illustration and it is to be fully understood that thein'. ention is in no way dependent upon the relative number of long andshort butt jacks emrefer to Figs. 8, 9, 12-15, 20 and 21. In Fig. 9 areshown the six cams which function upon said jacks, said cams beingdesignated by numerals 2"), 2H, 2I2, 2I3, 2I4, and 2I5. Thecamsdesignated at 2 and 2I5 are of triangular shape and are rigidlyconnected to the circular base by means of screws passing through theextensions 2I8 and 2". Cam 2I8 is known as the suture cam and ispermanently attached to a stem 2! which slides in a suitable bracket 2I9which is adjustably connected to the circular base. A sliding member 228which carries a stepped and inclined slot 22I is adapted to bereciprocated within said bracket by. mechanism later to be described.Cam stem 2! has secured therein a pin 222 which projects through theslot .22I and thus, when element 228 is reciprocated, the pin will beforced in a radial direction within stepped slot 22I so that said camwill be positioned either in its inactive position as shown in Fig. 9,an intermediateposition wherein it will engage only long butt jacks, andin a third or inner position where it will engage both types of jacks.Attached to a pivot point 223 on one end of the base of bracket 1 84 isa bell crank lever having one arm 224 connected to slide 228 and anotherarm 225 to which is attached a link 226. This link 228 is actuated bybell crank lever 221 pivoted upon a bracket 228 fixed in an uprightposition on the circular gular bracket 233. This lever 23I extends tothe other side of its pivot point and terminates in a cam engaging toe234. This toe is contacted by appropriate cams on the stop motion camdrum 19 which through the linkage just described, ac-' tuates slide 228and thus cam 2I8. A spring 235 attached to the side itself and anotherspring 236 connected to lever 23I function to return said linkage andcam to their initial position after toe 234 has passed over-the camsbeforementioned.

Cams designated at 2I2 and 2I4 and known as the high-splice and doublesole cams. are actuated by mechanisms shown in Figs. 6, 8, 9, 12-15, 20and 21. Referring to Figs. 14 and 15 cam 2I2 has a stem 231 which slidesin a bracket 238 connected by suitable screws to the base member 24. Apin 239 extends upwardly from the cam stem and projectsthrougha slot 248which extends ina radial direction in cap 2 on bracket 238. This'pin isalsoengaged by a slot 242 extending lengthwise of a lever 243 pivoted onthe bracket at 244. The last mentioned lever has connected to its freeend a link 245 which is adapted to swing said lever about-its pivot whena shaft 248 (Figs. 8 and 9) carrying an arm 24'! fixed at one end ofsaid shaft and having its other end pivoted at 248 to said link isoscillated. This shaft 248 is mounted for rotation

